RCW 59.20.250

Mediation of disputes by independent third party.

The landlord and tenant may agree in writing to submit any dispute arising under this chapter or under the terms, conditions, or performance of the rental agreement to mediation by an independent third party or to settle the dispute through industry mediation procedures. The parties may agree to submit any dispute to mediation before exercising their right to arbitration under RCW 59.20.260.